Choke-coil amplification unit



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EDWARD E. HILER, F BLOOMFIEIKD, NEW JERSEY, ASSGNOR TO IRVI'N'GTON VARNISH v do INSULATOR CO., OF IRVING'LEON, NEW JERSEY, A CORPORATION 0F NEW JERSEY.

CHOKE-COIL AMPLIFICATON UNIT.

Application filed August 27, J1925. Serial No.. 52,858.

This invention relates, generally, to an improved construction of chokecoil amplification unit for use in radio signal amplifying circuits of the kind described in my a copendingl application for United States Letters Patent, Ser. No.l 684,931/15, filed January 8th, 1924.

This invention has for itsprincipal object to provide a compact, simple and effective device in a unitary form adapted to provide two choke coils on a circuit together with a coupling grid condenser, and so interrelated in the unitary ystructure that only Vfour wires issue from the unit in connection with external terminals or binding posts, whereby the elements of the unitmay be readily cennected in an audio circuit in proper functioning relation thereto.

Other objects of this invention, not at lthis time more particularly enumerated, will be clearly understood from the following detailed description of the same.

This invention is clearly illustrated in the accompanying drawings, in which z- Figure 1. -.is al side elevation of the novel choke coil amplification unit, with a portion of the casing broken away'to show the arrangement and connections of the internal elements, Figure 2 is a top or plan View of the same, with the casing partially broken away; and Figure 3`is an end view of the same, also with the casing partially broken war Figure 4 is a vertical longitudinal section, taken on line 4-4 in Figure 2; and Figure 5 is a horizontal section taken on line 5-5 in Figure 1.

Figure 6 is a perspective viewshowing the manner of assembling the corelaminaf,

tions for the choke coils; Figure 7 is a perspective view to showY the disposition of a core lamination at one side, and Figure 8 is a similar perspective view to show the dispostion of a core lamination at the opposite side of the pile, whereby the novel substantially figure 8 shape of core is obtained.

Similar characters of reference are employed in all of the hereinabove .described views, to indicate corresponding parts.

, Referring now to said drawings, the reference character 10 indicates a suitable casing, open at one side, for example at its bottom side, and provided in its opposite-side with suitably disposed insulated external binding g, which extend into the Ainterior ofsaid cas ing 10. .The reference character 11 indicates a choke coil arranged for electrical connection between the battery terminal connection B and the plate terminal connectionl P, and to this end having the internal end 12 of its winding connected `to the terminal lug and the external end 13 of its winding connected to the terminal lug p. The reference character 14 indicates a second choke coil arranged for electrical connection between the filament terminal connection F and the grid terminal` connection G, and to this end having the intern-al end 15 of its winding connected to the terminal lug f, and the external end 16 'of its winding connected to thefterminal' lug g. As arranged in the unit the said choke coils are mounted adjacent to each other, that is side by side, upon a novel arrangement of laminated metallic core made, e. g., of annealed carbon sheet steel substantially in the form of afigure 8, with the respective coils disposed around the respective outer lateral members of said core, but with the intermediate lateral member of the latter disposed between the choke coils, thus assuring a proper magnetic circuit for each coil 'without yintervening air gap. Preferably lmatched members 17 and 18 to produce the substantially figure 8 shape, the same are eral arm 21 of the one abuts the long lateral arm of the other, respectively at each end of the -assembled lamination, thus bringing the diagonally cut ends 23 of the middle lateral arms 22 into abutting relation. Inassembling the pile of laminations thus formed, the same are so relatively disposed that the long arm 2O of alternate lamina- 'opposed to each other so that the short lat- 100 tions overlie the short arms 21 of intermediate laminations, while at the same time thediagonalsubdivisions of adjacent laminations cross each other, all' of which is more particularly shown in Figure 6 of the drawings. By thus assembling the lamination members, there is produced an interlocking contact one with the other which assures a complete magnetic path throughout the body of the core,` without interruptions or internal air gaps. Another advantage of the above-described core 4struct-ure resides in the ease with which the same may be assembled with pre-wou11d'-coils by inserting the separable merhbers 17 and 18 respective-- construction, the same being mounted inter.

' mediate the top of the casing 10 and the desirable.

intermediate lateral member of the laminate core structure, so as to lie between the respective choke coils 11 and 14. One pole, as

25, of said condenser element is electricallyconnected with the terminal lug p of the plate terminal connection P, and the other pole, as 2G, of said condenser element is electrically'connected with the terminal lug g of the grid terminal connection G, thus positioning the condenser, when the device is included in a radio receiving circuit, between the output side or plate of one amplifying vacuum tube and the grid of Aa succecding amplifying vacuum tube with which the receiving circuit may be provided.

When the choke coils with the novel core structure and the condenser element are assembled in the manner above-described and inserted within the casing 10, the interior of the latter is filled with paraffin, pitch or other suitable compound 27 which entirely surrounds/the said internal assembled elements within casing, so that the same are immovably retained therein. When the device is thus\assembled and provided with the filling compound 27, the open bottom of the casing 10 is closed by a lcover or closure section or plate 28, 4which may be fastened in any suitable manner in connection with the body of thel casing 10, as, e. g., by clenching lugs 29 connected with` the latter so 'as to be turned over into holding engagement with said cover or closure.

The casing 10 is furthenprovided with perforate ears 30 at any suitable point, so that the complete unit may be attached to a support in such position as may be deemed ing respectively mounted on the respective Y outer lateral members of said core so that the intermediate lateral member of said core lies between said coils, and a condenser element Within said casing disposed intermediate said coils and electrically connected between certain of said circuit connections.

2. A unitary device of the kind described, comprisingA an enclosing casing having external circuit connections consisting of a battery connection, a plate connection, a lilament connection and a grid connection; a pair of choke coils within said casing, one of said choke coils being electrically connected between said battery and plate con nections, and the other of said choke coils,

being electrically connected between the filament and grid connections; a laminate core substantially in the form of a figure 8, said choke coils being respectively mounted on the respective outer lateral members of said core so that the intermediate lateral member of said core lies between said coils; and a 'condenser elementr within said casing dis posed intermediate said coils and electrically connected between said plate and grid connections.

3. A unitary device of the kind described, comprising a laminat-e core substantially in the form of a ligure 8, each lamination comprising opposed members having abutting lateral extensions of various lengths, and said lami'nations being assembled in alternated arrangement so that the divisions of their members are staggered to form an intelocking'contact of one lamination with another; a pair of choke coils respectively mounted on the respective outer lateral portions of the core so that the intermediate lateral member of said core lies between said coils; a casing to enclose said coils and core; said casing having external circuit connections between certain of which the said coils are respectively electrically connected; and a filler compound within said casing in which said coils and core are imbedded.

4. A unitary device of the kind described, comprising a laminate core substantially in the form of a tigure, each lamination comprising opposed members having abutting lateral extensions of various lengths, and said laminations being assembled in alternated arrangementso that the divisions of their members are staggered to form an interlocking contact of one lamination with another; a pair of choke coils respectively mountedA on"the respective outer lateral portions of the-core so that the intermediate lateral member of said core lies between'said coils; a casing to enclose said coils and core; said casing having external circuit connections between certain of which the said coils are respectively electrically connected; a condenser element also enclosed within said casing and electrically connected betweenl certain of said external circuit connections; and a filler compound Within said casing in which said coils and core, and said condenser element are imbedded.'

5. A unitary device of the kind described, comprising an enclosing casing having external circuit connections, a pair of choke coils Within said casing electrically interconnected between certain of said circuit connections, a laminate core substantially in the form of a figure 8, said choke coils being rcspectively mounted on the respective outer lateral members of said core so that the intermediate lateral member of said core lies between said coils, a condenser element within said casing disposed intermediate said coils and electrically connected between certain of said circuit connections; and a filler compound in said casing in which said coils and core, and said condenser element are imbedded.

6. A unitary device of the kind described, comprising an enclosing casing having 'external circuit connections consisting of a battery connection. a plate connection, a-

ilament connection and a grid connection;

a pair of choke coils' Iwithin said casing, one

of said choke coils being electrically connected between said battery and plate connections land the other of said choke coils being electrically connected between the lilamentand grid connections: a laminate core substantially in the form of a figure 18, said choke coils being respectively mounted on the respective outer lateral members of said core so that the intermediate lateral mem-- her of said core lies between said coils; a condenser element Within said casing disposed intermediate said coilsI and electrically connected between said plate and grid connections; and a filler compound in said castween said battery and plate connections, and the other of said coils being electrically connected between the lfilament and rid connections; and a laminate core upon w ich said coils are mounted in side by side relaf tion', said core having means to provide a magnetic shield intermediate said coils.

8. A unitary device of the kind described, comprising an enclosing casing having external circuit connections consisting of a battery connection, a plate connection, a filament connectionand a grid connection; a pair of choke coils- Within said casing, one of said coils being .electrically connected between said battery and plate connections, and the other of said coils being electrically connected between the filament and grid' connections: a laminate core upon which'said coils are mounted in side by side relation, said core having means to provide a magnetic shield intermediate said coils; and a filler compound in said casing in which said coils and core are imbedded.

9. A unitary device of thekind described, comprising 'an enclosing casing having -external circuit connections consistingof a battery connection, a plate connection, a filament connectionland a grid connection; 'a

pair of choke coils within said'casing, one of said coils being electrically connected between said battery and plate connections, and the other of said coils being electrically connected between the filament and grid connections; a laminate core upon which said coils are mounted in side by siderela tion, said core having means to lprovide a magnetic shield intermediate said coils; and a condenser element also enclosed within said casing and electrically connected between said plate and grid connections.

10. A unitary device of the kind de? scribed, comprising an enclosing casing having external circuit connections consisting of a battery connection, a plate connection, a filament connection and a grid connection; a pair of choke coils within said casing, one of said coils lbeing electrically connected between said battery and plate connections, and the other of said coils being electrically connected between the filament and grid connectionsf a laminate core upon which said coils are mounted in side by side relation, said` core having means to provide a magnetic shield intermediate said coils; a condenser element also enclosed'within said ion casing and electrically connected between"A EDWARD E. HILER. 

